Yealink SIP-T48U Administrator's Guide

Account Settings
304
DNSTTL on the registered server expires, the phone will retry to send requests to the primary server.
2-Registration: the phone will send requests to the last registered server first. If the registration
expires, the phone will retry to send requests to the primary server.
3-duration: the phone will send requests to the last registered server first. If the time defined by the
“account.X.sip_server.Y.failback_timeout” parameter expires, the phone will retry to send requests to
the primary server.
Default
0
Parameter
account.X.sip_server.Y.failback_timeout
[1][2]
<MAC>.cfg
Description
It configures the timeout (in seconds) for the phone to retry to send requests to the primary server after
failing over to the current working server.
If you set the parameter to 0, the phone will not send requests to the primary server until a failover
event occurs with the current working server.
If you set the parameter between 1 and 59, the timeout will be 60 seconds.
Note: It works only if “account.X.sip_server.Y.failback_mode” is set to 3 (duration).
Permitted
Values
0, Integer from 60 to 65535
Default
3600
Parameter
account.X.sip_server.Y.failback_subscribe.enable
[1][2]
<MAC>.cfg
Description
It enables or disables the phone to retry to re-subscribe after registering to the secondary server with
different IP addresses when encountering a failover.
Note: It works only if "account.X.sip_server.Y.failback_mode" is set to 1, 2 or 3.
Permitted
Values
0-Disabled
1-Enabled, the phone will immediately re-subscribe to the secondary server, for ensuring the normal
use of the features associated with the subscription (for example, BLF, SCA).
Default
0
Parameter
account.X.outbound_proxy.Y.register_on_enable
[1][2]
<MAC>.cfg
Description
It enables or disables the phone to register to the secondary outbound proxy server before sending
requests to it when encountering a failover.
Permitted
Values
0-Disabled, the phone will not attempt to register to the secondary outbound proxy server, since the
phone assumes that the primary and secondary outbound proxy servers share registration inform-
ation. So the phone will directly send the requests to the secondary outbound proxy server.
1-Enabled, the phone will register to the secondary outbound proxy server first, and then send the
requests to it.
Default -1, the phone will invoke “account.X.sip_server.Y.register_on_enable” to take effect.
Parameter
account.X.outbound_proxy.Y.retry_counts
[1][2]
<MAC>.cfg
Description
It configures the retry times for the phone to resend requests when the outbound proxy server Y is
unavailable or there is no response from the outbound proxy server Y.
The phone moves to the next available outbound proxy server after three failed attempts.
Permitted
Values
Integer from 0 to 20
Default -1, the phone will invoke “account.X.sip_server.Y.retry_counts” to take effect.
Parameter
account.X.outbound_proxy.Y.only_signal_with_registered
[1][2]
<MAC>.cfg

Yealink SIP-T48U Specifications

General

Handset type	Wired handset
Product type	IP Phone
Product color	Gray
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
Expansion module support	Yes
Ethernet LAN (RJ-45) ports	2
Display diagonal	7 \
Display resolution	800 x 480 pixels
Lines quantity	- lines
Phonebook capacity	1000 entries
Number of VoIP accounts	16
Voice codecs	AGC, AJB, AMR-WB, CNG, G.711, G.722, G.723.1, G.726, G.729ab, VAD, iLBC
Security algorithms	AES, HTTPS, SRTP, TLS
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Front camera	-
AC adapter input voltage	100 - 240 V
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Keypad number of keys	29
Number of handles included	1 pc(s)
Harmonized System (HS) code	85171800

Weight and Dimensions

Width	226 mm
Height	185 mm